NASA Announces Black Holes Found to be "Green" |
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NASA Announces Black Holes Found to be "Green" |
 Apr 18 2006, 11:52 AM
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 Member  Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471  |
- NASA Announces Black Holes Found to be "Green"
<< Astronomers using NASA's Chandra X-ray Observatory will hold a media teleconference at 1 p.m. EDT Monday, April 24, to announce a fundamental discovery about black holes. >> Any guesswork?? -------------------- - blue_scape / Nico -
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Apr 18 2006, 03:49 PM
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
They don't burn hydrocarbon fuels, dining on naturally produced stars:)
I'm half kidding. I guess they will announce 'black holes' axially emit copious quantites of hydrogen gas, creating new star forming regions of space. |
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Apr 18 2006, 04:01 PM
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
Well, I was close: (From Space Reference Daily)
http://www.spaceref.com/news/viewsr.nl.html?pid=20300 "Our results show that the black hole engines at the hearts of large elliptical galaxies and groups feed back sufficient energy to stem cooling and star formation, leading naturally to the observed exponential cut off at the bright end of the galaxy luminosity function." In fact, I was really close: Our results show that a significant fraction of the energy associated with the rest mass of material entering the Bondi accretion radius (2.4+1.0 −0.7 per cent, for Pjet = 1043 erg s−1 ) eventually emerges in the relativistic jets. Full paper: http://xxx.lanl.gov/PS_cache/astro-ph/pdf/0602/0602549.pdf |
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Apr 19 2006, 03:00 PM
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 Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
PHYSICS NEWS
- NASA Simulation Beats Gravity Wave Overloads http://www.spacedaily.com/reports/NASA_Sim..._Overloads.html Greenbelt MD (SPX) Apr 18, 2006 - NASA scientists said Tuesday they have developed a new computer model that can simulate the gravitational waves generated by merging black holes without crashing. The three-dimensional simulations represent the largest astrophysical calculations ever performed on a NASA supercomputer, the space agency said in a statement. -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Apr 24 2006, 05:23 PM
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#5
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
NGC 4696 in the Centaurus Galaxy Cluster:
Black Holes Found To Be Green By NASA's Chandra - http://chandra.harvard.edu/photo/2006/bhcen/ -------------------- - blue_scape / Nico -
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Jun 9 2006, 07:34 PM
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#6
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
Astrophysics, abstract
astro-ph/0606178 From: Catherine E. Grant [view email] Date: Wed, 7 Jun 2006 22:19:41 GMT (425kb) Temperature dependence of charge transfer inefficiency in Chandra X-ray CCDs Authors: C. E. Grant, M. W. Bautz, S. E. Kissel, B. LaMarr, G. Y. Prigozhin (MIT) Comments: 9 pages, 8 figures, to appear in Proc. SPIE vol 6276 "High Energy, Optical, and Infrared Detectors for Astronomy II" Soon after launch, the Advanced CCD Imaging Spectrometer (ACIS), one of the focal plane instruments on the Chandra X-ray Observatory, suffered radiation damage from exposure to soft protons during passages through the Earth's radiation belts. The primary effect of the damage was to increase the charge transfer inefficiency (CTI) of the eight front illuminated CCDs by more than two orders of magnitude. The ACIS instrument team is continuing to study the properties of the damage with an emphasis on developing techniques to mitigate CTI and spectral resolution degradation. We present the initial temperature dependence of ACIS CTI from -120 to -60 degrees Celsius and the current temperature dependence after more than six years of continuing slow radiation damage. We use the change of shape of the temperature dependence to speculate on the nature of the damaging particles. http://arxiv.org/abs/astro-ph/0606178 -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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